assertNotNull(field);
assertEquals(hello, field.getBody());
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
header.writeTo(buffer, MessageUtils.LENIENT);
String s = buffer.toString(MessageUtils.ISO_8859_1.name());
assertEquals("Hello: " + hello + "\r\n" +
"Content-type: text/plain; charset=ISO-8859-1\r\n\r\n", s);
}